Can the rest of the world stay out of it when Russia's invasion of Ukraine starts to threaten food supplies? This week's bombing of the Black Sea resort of Odesa is a reminder that Moscow is blockading Ukraine's main port of export for wheat and other grains. The UN's World Food Programme relies on those cereals and they are already feeling the pinch in places like war torn-Ethiopia.
We ask what it would take to reopen the Black Sea and about alternatives, such as the land route through Poland suggested by the EU agriculture commissioner.
